Factors C1 and C2 for Mcr calculations

[Anonymous]

Hi,

I would like to know how Robot Structural Analysis calculates the factors C1 and C2 for the critical moment for lateral-torsional buckling (Mcr). On Steel/Aluminium Design, checking the detailed results of a beam, it is said that those factors where calculated according to "Annexe M" but I couldn't find it in ENV 1993-1-1...

By the way, is there any other way to check, on Robot, more information about the calculation of these parameters (C1 and C2 in this case, or the value of k or kw in the expression of Mcr, for exemple)?. Is there any other way of getting to know the parameters used to calculate Mcr, behond those presented on the detailed results?

Thanks for your help, I hope I was understandable...

Gonçalo Marques

[Artur.Kosakowski · Accepted solution]

Please check:

https://forums.autodesk.com/t5/robot-structural-analysis-forum/critical-moment/m-p/3335273

https://forums.autodesk.com/t5/robot-structural-analysis-forum/lateral-buckling-critical-moment/m-p/...

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[Anonymous]

My main question is if there are any other way to check some intermediate values used by Robot to calculate Mcr... If I have a simple beam I can get similar values to those that Robot presents, but if I add one bracket in the connection beam-column, I can't get the Mcr presented in Robot. Those parameters, k and kw, are not presented in the detailed results... Can I get them anywhere else?

[Artur.Kosakowski · Accepted solution]

No, all available values are these in the detailed calculation note.

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.